OpenTripPlanner groups identical patterns with different shapes and return the wrong shape for trips

[miklcct]

Construct a GTFS data set of multiple trips consisting of identical calling patterns, but with different shapes, as they uses different routes between the same stops.

Make a journey plan on the route for various times to return different trips.

Expected behavior

The shape corresponding to the trip is returned in the result.

Observed behavior

A wrong shape is returned for some of the trips.

Version of OTP used (exact commit hash or JAR name)

2.4.0

Data sets in use (links to GTFS and OSM PBF files)

A custom data set

[t2gran]

Is this a theoretical problem? Do you serve the same stops with multipe modes?

This is usually not a problem, since different modes does not share the same stops. Also, it is probably not important enough to fix - depending on how complex it is to do so. A bit more context why this is a problem would help. Unless someone comes up with a good use-case, we would like to keep just one pattern for a given sequence of stops.

[miklcct]

I used a real dataset representing National Rail data which is under development. All the trips are of the same mode (train).

There are a number of train services which call at the same stations, but use different routing because there are track works affecting the normal route.

[miklcct]

Also different modes (metro and rail) do share stops in London (bus and tram also share stops in Stockholm as well on the route 7 - it is a tram route but relief vehicles can be buses). I haven't tested the behaviour on this but plan to do so when I can produce an integrated feed of tube and rail.